Yamaha WR250FM service manual Front fork setting, Change in level and characteristics of fork oil

SETTING

T U N

EC722011

Front fork setting

The front fork setting should be made depend- ing on the rider’s feeling of an actual run and the circuit conditions.

The front fork setting includes the following three factors:

1.Setting of air spring characteristics

•Change the fork oil level.

2.Setting of spring preload

•Change the spring.

•Install the adjustment washer.

3.Setting of damping force

•Change the compression damping.

•Change the rebound damping.

The spring acts on the load and the damping force acts on the cushion travel speed.

EC723001

Change in level and characteristics of fork oil

Damping characteristic near the final stroke can be changed by changing the fork oil amount.

CAUTION:

Adjust the oil level in 5 mm (0.2 in) incre- ments or decrements. Too low oil level causes the front fork to produce a noise at full rebound or the rider to feel some pres- sure on his hands or body. Alternatively, too high oil level will develop unexpectedly early oil lock with the consequent shorter front fork travel and deteriorated perfor- mance an characteristics. Therefore, adjust the front fork within the specified range.

Standard oil level: 135 mm (5.31 in)

*130 mm (5.12 in)

**125 m (4.92 in) Extent of adjustment:

80 ~ 150 mm (3.15 ~ 5.91 in) From top of outer tube with inner tube and damper rod fully compressed without spring.

*For EUROPE

**For AUS, NZ and ZA

7 - 13